For me iOS 10 has 2 minor positive points and 2 bigger negatives. I know it has some extra abilities compared to 9, but I don't use that stuff.
positive: better event notifications in Safari (before they were visible for about 1/10 second)
positive: desktop redrawing seems faster
negative: they killed "slide to unlock" which is the best unlock method for devices without Touch ID
negative: Control Center on 2 panels is a nuisance
They need to bring back "slide to unlock", at least as an option. I guess everyone working at Apple has a new device with Touch ID so they don't notice the new unlock method is awkward for people with older devices like my iPad Air.